Table 4.

Multivariate linear regression analysis (Model 2) of factors independently associated with initial serum β-hCG levels

Variable	Unstandardized Coefficient	Standardized Coefficient	t-value	p-value
PGT vs. non-PGT	6.240	0.031	1.820	0.069
Maternal age	0.202	0.010	0.541	0.588
BMI	−4.094	−0.182	−11.028	< 0.001*
Duration of infertility	−0.032	−0.015	−0.870	0.384
Endometrial thickness	−0.060	−0.026	−1.604	0.109
Previous spontaneous miscarriage	−27.004	−0.195	−11.997	< 0.001*
Day of blastocyst transfer	−16.439	−0.031	−1.885	0.059
Blastocyst grading	9.585	0.133	8.131	< 0.001*

Initial β-HCG levels were measured on day 9 post-blastocyst transfer

Asterisk (*) indicates statistical significance, defined as p < 0.05